Suppose the parallel sides of the trapezium are a and b units where a < b. Then the fraction of the area of the trapezium that is the rhombus is a/[(a+b)/2] = 2a/(a+b).
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trapazoid has 1 set parallel lines and a rhombus has 2 sets of parallel lines
Technically, yes - a trapezoid is a four-sided figure with two parallel sides. A rhombus is a four-sided figure with two pair of parallel sides. A rhombus might be described as a special trapezoid since it does have two parallel sides, but others might argue against such an interpretation.Likewise, a square could be described as a special rhombus (or a very special trapezoid), since a square is a four-sided figure with two pair of parallel sides AND four right angles.
1 rhombus 4-5 triangles
No, a trapezoid has only 1 pair of parallel lines exactly. In a rhombus, all lines are parallel and congruent.